# How fast do different parts of the EM spectrum travel in a vacuum?

Nov 20, 2016

At the speed of light.

#### Explanation:

Remember that the EM spectrum are comprised of energy waves. Light is an energy and is part of the EM spectrum.

Speed of light in a vacuum is $299 792 458 \frac{m}{s}$. Most people round to $3.0 \times {10}^{8}$. However the speed alters when travelling in through a medium, like water or air.

Hope this helps :)

Sep 28, 2017

All parts of the EM spectrum travel at $3 \cdot {10}^{8} \frac{m}{s}$.